Zipper, child resistant zipper bag and opening method thereof

ABSTRACT

The present application provides a zipper, a child resistant zipper bag and an opening method thereof. A zipper includes a first wing and a second wing, at least one first strip is provided on an inner side of the first wing, at least one second strip is provided on an inner side of the second wing, the number of the second strip corresponds to that of the first strip, and the first strip is interlocked with the second strip, and a protrusion is provided on an outer side of the first wing and/or an outer side of the second wing.

CROSS-REFERENCE TO RELATED APPLICATION

The present application is based on and claims the priority benefits of China application No. 202110858473.5, filed on Jul. 28, 2021. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.

BACKGROUND Technical Field

The present application relates to the technical field of packing bag, and in particular to a zipper, a child resistant zipper bag and an opening method thereof.

Description of Related Art

Currently, most of zipper bags that are available in the market are sealed with a zipper. Since the structure of the common zipper is relatively simple, the bag can be opened by unzipping the zipper, which has a poor safety and is difficult to protect children.

In the prior art, a child resistant zipper bag is designed to be difficult to open from the opening of the bag. Such child resistant zipper bag may be opened by gripping the sliding zone on the outer surface of the bag, of which the orthographic projection is within the area of the strip, and then unzipping the zipper by sliding the zipper in the same direction or opposite directions. The hands of children under four years of age are relatively uncoordinated. Such child resistant zipper bag in the prior art can prevent children from opening the bag to a greater extent. The sliding zone can improve the friction of the bag to facilitate opening the bag by the adult.

However, in the prior art, the sliding zone is generally formed by ink printing. Thus, after long-term sliding, the sliding zone on the surface of the bag will gradually disappear, which will lose the role of increasing friction.

SUMMARY

In order to solve the problem of losing friction in the sliding zone on the surface of the bag due to long-term sliding, the present application provides a zipper, a child resistant zipper bag and opening method thereof.

In a first aspect, the present application provides a zipper as described below.

A zipper includes a first wing and a second wing, wherein at least one first strip is provided on an inner side of the first wing, at least one second strip is provided on an inner side of the second wing, the number of the second strip corresponds to that of the first strip, and the first strip is interlocked with the second strip, and a protrusion is provided on an outer side of the first wing and/or an outer side of the second wing.

By means of the technical solution above, the protrusion can enhance the concave-convex feeling on the back of the zipper, i.e., enhancing the concave-convex feeling on the sides of the first wing and the second wing that face away from each other, which facilitate increasing of the friction force when the fingers grip the zipper. Two hands grip the first strip and the second strip and slide the zipper in the same direction or opposite directions such that the first strip misaligns with the second strip so as to separate the first strip and the second strip. The arrangement of the protrusion can also facilitate the deformation of the first strip and the second strip when the zipper is slid, thereby facilitating the separating of the zipper.

In an embodiment, the protrusion includes a first bulge, wherein the first bulge is located at an area corresponding to a projection area of the first strip on the first wing and/or the first bulge is located at an area corresponding to the projection area of the second strip on the second wing.

By means of the technical solution above, the zipper can be unzipped by sliding the zipper along the length direction of the first bulge, which can facilitate the deformation of the first strip and the second strip, thereby facilitating the separating of the zipper.

In an embodiment, at least one second strip is provided on the first wing, at least one first strip is provided on the second wing, and the first bulge is located at the area corresponding to the projection area of the second strip on the first wing and/or the first bulge is located at the area corresponding to the projection area of the first strip on the second wing.

In an embodiment, at least one first strip and at least one second strip are provided on the first wing from top to bottom, and at least one second strip and at least one first strip are provided on the second wing from top to bottom; the first strip of the first wing is interlocked with the second strip of the second wing, and the first strip of the second wing is interlocked with the second strip of the first wing;

the protrusion includes a second bulge that is located between the first strip and the second strip of the first wing and/or the second wing.

In an embodiment, the protrusion includes a third bulge, wherein the third bulge is integrally formed with the first strip and the second strip; the first strip and the second strip adopt a multi-snap-fit structure, and the first strip is interlocked with the second strip by snap-fit.

By means of the technical solution above, the design of the multi-snap-fit structure can make the interlocking of the first strip with the second strip more stable and more difficult to separate directly, which can better prevent children from opening the bag.

In an embodiment, a side of the protrusion that is away from the first strip or the second strip is a cambered surface.

By means of the technical solution above, the design of a cambered surface can reduce the discomfort when the fingers gripping the protrusion while facilitating the unzipping of the zipper.

In a second aspect, the present application provides a child resistant zipper bag as described below.

A child resistant zipper bag includes a bag body that is connected with a zipper that is provided with a protrusion, wherein the first wing includes a first upper wing and a first lower wing, which are integrally connected to each other; the first upper wing is located above a location where the first strip and/or the second strip are provided on the first wing, the first lower wing is located below the location where the first strip and/or the second strip are provided on the first wing, outer sides of the first upper wing and the first lower wing are connected to an inner side of the bag body;

-   the second wing includes a second lower wing that is provided in     correspondence to the first lower wing, an outer side of the second     lower wing is connected to an inner side of the bag body, the first     strip and/or the second strip are located at an upper end of the     second lower wing, and the strips of the first wing and the second     wing are correspondingly interlocked with each other; -   the protrusion is attached to the inner side of the bag body.

By means of the above technical solution, when the bag body is pulled from the opening thereof, the force points are located on positions at which the first upper wing and the second lower wing are connected with the bag body. Due to misalignment of the force points on the zipper, it is difficult to separate the first strip and the second strip and thus it is difficult to unzip the zipper from the opening of the bag body. Two hands grip the first strip and the second strip and slide the zipper in the same direction or opposite directions such that the first strip misaligns with the second strip so as to facilitate the opening of the bag opening.

The protrusion can increase the concavo-convex feeling of the bag body surface of the first strip and the second strip or near the first strip and the second strip, thereby increasing the friction force when the finger grips the bag, such that the bag can be opened easier by an adult. The hands of children under four years old are relatively uncoordinated, so that the child resistant bag can prevent children from opening the bag to a greater extent.

In an embodiment, the second wing further includes a second upper wing that is provided in correspondence to the first upper wing and is integrally connected to the second lower wing at the location where the first strip and/or the second strip are provided on the second wing, and an outer side of the second upper wing is connected to the inner side of the bag body;

a first tear line is provided on the first upper wing and the second upper wing, a second tear line is provided on the bag body, the first tear line and the second tear line are in a same straight line, and a distance between the first tear line and the first strip is less than 10 mm.

By means of the above technical solution, the bag body may be torn open from the first tear line and the second tear line such that the first upper wing and the second upper wing are ripped off at the first tear line and the bag body is separated at the second tear line. Since the distance between the first tear line and the first strip is less than 10 mm, the finger holding margin at the opening of the bag is small. It is difficult to apply force in pulling the bag opening, and thus it is difficult to open the bag from the bag opening. The zipper can be gripped through the bag and is slid to unzip the zipper. During the process of sliding the zipper, the protrusion can increase the friction between the fingers and the bag body and thus reduce the difficulty of sliding.

In an embodiment, an embossing is provided on the inner side of the bag body.

By means of the above technical solution, the arrangement of the embossing can facilitate vacuum pumping of the bag body with a household vacuum sealer.

In a third aspect, the present application provides a method of opening a bag as described below.

A method of opening a bag includes following steps:

-   S1: gripping, by two hands, a bag body at a location where a first     strip and a second strip are located such that a protrusion is     gripped against by fingers through the bag body; -   S2: sliding, by two hands, the bag body in the same direction or     opposite directions such that the interlocking between the first     strip and the second strip is misaligned; -   S3: opening the bag body from a position at which the first strip     misaligns with the second strip.

In a fourth aspect, the present application provides a method of opening a bag as described below.

A method of opening a bag includes following steps:

-   S1: tearing a bag body along a first tear line and a second tear     line such that a first upper wing and a second upper wing are     separated from each other along the first tear line and the bag body     is torn open along the second tear line; -   S2: gripping, by two hands, a bag body at a location where a first     strip and a second strip are located such that a protrusion is     gripped against by fingers through the bag body; -   S3: sliding, by two hands, the bag body in the same direction or     opposite directions such that the interlocking between the first     strip and the second strip is misaligned; -   S4: opening the bag body from a position at which the first strip     misaligns with the second strip.

In sum, the present application can provide at least one of the following beneficial technical effects.

-   1. The arrangement of a protrusion can enhance the concave-convex     feeling on the back of the zipper, which facilitate increasing of     the friction force when the fingers grip the zipper. When the zipper     is slid in the same direction or opposite directions, the first     strip can misalign with the second strip so as to separate the first     strip and the second strip. -   2. The arrangement of a first bulge can facilitate the deformation     of the first strip and the second strip when the zipper is slid,     thereby facilitating the separating of the zipper. -   3. The design of a cambered surface for the protrusion can reduce     the discomfort when the fingers gripping the protrusion while     facilitating the unzipping of the zipper.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic structure diagram of a zipper according to the first embodiment of the present application.

FIG. 2 is a schematic diagram illustrating the connection of the zipper with a first film and a second film according to the first embodiment of the present application.

FIG. 3 is a schematic diagram illustrating unfolding of a bag body according to the first embodiment of the present application.

FIG. 4 is a schematic diagram illustrating pulling of an opening of the bag body according to the first embodiment of the present application.

FIG. 5 is a schematic diagram illustrating sliding of the bag body according to the first embodiment of the present application.

FIG. 6 is a schematic structure diagram of a zipper according to the second embodiment of the present application.

FIG. 7 is a schematic diagram illustrating the connection of the zipper with a first film and a second film according to the second embodiment of the present application.

FIG. 8 is a schematic structure diagram of a zipper according to the third embodiment of the present application.

FIG. 9 is a schematic diagram illustrating the connection of the zipper with a first film and a second film according to the third embodiment of the present application.

FIG. 10 is a schematic structure diagram of a zipper according to the fourth embodiment of the present application.

FIG. 11 is a schematic diagram illustrating the connection of the zipper with a first film and a second film according to the fourth embodiment of the present application.

FIG. 12 is a schematic structure diagram of a zipper according to the fifth embodiment of the present application.

FIG. 13 is a schematic diagram illustrating unfolding of a bag according to the sixth embodiment of the present application.

FIG. 14 is a schematic structure diagram of a zipper according to the seventh embodiment of the present application.

FIG. 15 is a schematic diagram illustrating unfolding of a bag according to the seventh embodiment of the present application.

FIG. 16 is a schematic diagram illustrating opening of a bag according to the seventh embodiment of the present application.

DESCRIPTION OF THE EMBODIMENTS

The present application will be described in detail below with reference to FIGS. 1-16 .

A zipper, a child resistant zipper bag and an opening method thereof are provided according to embodiments of the present application.

The First Embodiment

Reference to FIGS. 1 and 2 , a zipper includes a first wing 1 and a second wing 2 that is provided opposite to the first wing 1. The first wing 1 includes a first upper wing 11 and a first lower wing 12, which are connected with each other. The first upper wing 11 or the first lower wing 12 is connected to a first strip 13. In this embodiment, the first strip 13 is provided at a position at which the first upper wing 11 is connected to the first lower wing 12. The second wing 2 includes a second lower wing 22 that is provided in correspondence to the first lower wing 12. The second lower wing 22 is provided with a second strip 23 at the upper end of the first upper wing 11. The second strip 23 is configured to be interlocked with the first strip 13. A protrusion 3 is respectively provided at sides of the first wing 1 and the second wing 2 that face away from each other. The protrusion 3 is provided as a first bulge 31 that is provided along a length direction of the zipper. The first bulge 31 is located at an orthographic projection area of the first strip 13 and/or the second strip 23. The first bulge 31 may be any one of a continuous straight line, curve, and polyline. In this embodiment, the first bulge 31 is a continuous straight line, which is respectively located at the direct back side of the first strip 13 and the second strip 23, and are provided to parallel to the first strip 13. The first bulge 31, the corresponding first wing 1 and second wing 2 may be produced by integral extrusion molding. Alternatively, the first bulge 31 may be attached to corresponding positions of the first wing 1 and second wing 2. In this embodiment, the first bulge 31, the corresponding first wing 1 and second wing 2 are produced by integral extrusion molding.

The principle of the zipper according to the present embodiment will be described below. Since only the first upper wing 11 can be gripped when separating the zipper, it is difficult to separate the zipper by unzipping it. Thus, two fingers in each hand may be used to grip the zipper at a position of the first bulge 31. Two fingers at the same side of the zipper slide in the same direction or opposite directions such that the first strip 13 is misaligned relative to the second strip 23 and further the first strip 13 is bent partly. Thus, the first strip 13 and the second strip 23 are slid to form two gaps there between, by means of which the zipper can be separated from the gaps. Since the fingertips are soft, when the first bulge 31 is gripped by a finger, the finger would feel the concave-convex feeling, which can increase the friction between the finger and the zipper, and thus facilitating unzipping of the zipper and reducing the deformation thereof.

Reference to FIGS. 3-5 , a child resistant zipper bag includes a bag body 4 with a zipper. A protrusion 3 is attached to the inner side of the bag body 4. The bag body 4 is in a form of stand-up bag. The bag body 4 includes a first film 41 and a second film 42, which are connected to each other by heat sealing. The first film 41 is connected to the first wing 1 by heat sealing, and the second film 42 is connected to the second wing 2 by heat sealing. The first film 41 is not heat sealed at the position of the first strip 13, and the second film 42 is not heat sealed at the position of the second strip 23.

The principle of the child resistant zipper bag according to the present embodiment will be described below. When the bag body is pulled apart at the opening thereof, the force points are located on positions at which the first upper wing 11 and the second upper wing 21 are connected to the bag body 4. Due to misalignment of the force points on the zipper, it is difficult to unzip the zipper from the opening of the bag body 4, which can prevent children from opening the bag and thus reduce the occurrence of accidental opening of the bag and ingestion of medicines, dry tablets and other items in the bag by a four-year-old child and child under four years of age. The bag body 4 can be opened by an adult as following: gripping the bag body 4 with hands at the positions of protrusions 3; two fingers at the same side of the zipper sliding in the same direction or opposite directions such that a part of the first strip 13 is bent along the length direction thereof and such that the interlocking of the first strip 13 with the second strip is misaligned, and further the zipper is unzipped.

Reference to FIGS. 3 and 5 , a method of opening a bag includes the following steps:

-   S1: gripping, by two hands, a bag body 4 at a location where a first     strip 13 and a second strip 23 are located such that a protrusion 3     is gripped against by fingers through the bag body 4; -   S2: sliding, by two hands, the bag body 4 in the same direction or     opposite directions such that the interlocking between the first     strip 13 and a second strip 23 is misaligned; -   S3: opening the bag body 4 from a position at which the first strip     13 misaligns with the second strip 23.

The Second Embodiment

FIGS. 6 and 7 illustrate a zipper that is different with the first embodiment as below. In this embodiment, at least one first strip 13 and at least one second strip 23 are provided on the first wing 1 from top to bottom, and at least one second strip 23 and at least one first strip 13 are provided on the second wing 2 from top to bottom. The first strip 13 and/or the second strip 23 are located at a position at which a first upper wing 11 is connected to a first lower wing 12. The outer side of the lower end of the second lower wing 22 is connected to the inner side of the bag body 4. The inner side of the upper end of the second lower wing 22 is connected with a first strip 13 and/or a second strip 23. The strips on the first wing 1 and the second wing 2 are correspondingly interlocked with each other. In the present embodiment, a first strip 13 and a second strip 23 are connected between the first lower wing 12 and the first upper wing 11. The upper portion of the second lower wing 22 is connected to a second strip 23 and a first strip 13. The first strip 13 of the first wing 1 is correspondingly interlocked with the second strip 23 of the second wing 2, and the second strip 23 of the first wing 1 is correspondingly interlocked with the first strip 13 of the second wing 2.

The distance between a first strip 13 and a second strip 23 on the same wing is 1-10 mm. In the present embodiment, the distance between a first strip 13 and a second strip 23 on the same wing is 6 mm. In the present embodiment, a protrusion 3 is provided as a second bulge 32 that is provided along a length direction of the zipper. Second bulges 32 are respectively provided at sides of the first wing 1 and the second wing 2 that face away from each other. Further, on the same wing, a second bulge 32 is provided between the first strip 13 and the second strip 23. The first wing 1 and a corresponding second bulge 32 are integrally molded, and the second wing 2 and a corresponding second bulge 32 are integrally molded.

The Third Embodiment

FIGS. 8 and 9 illustrate a zipper that is different with the second embodiment as below. In this embodiment, the first strip 13 and the second strip 23 on the first wing 1 are provided adjacent to each other. The second strip 23 and the first strip 13 on the second wing 2 are provided adjacent to each other. First bulges 31 are respectively provided at sides of the first wing 1 and the second wing 2 that face away from each other. Further, first bulges 31 are respectively provided on the direct back sides of the first strip 13 and the second strip 23.

The Fourth Embodiment

FIGS. 10 and 11 illustrate a zipper that is different with the first embodiment as below. In this embodiment, the first strip 13 and the second strip 23 adopt a multi-snap-fit structure. The interlock elements of the first strip 13 are interlocked with the interlock elements of the second strip 23. The protrusion 3 is provided as a third bulge 33. Third bulges 33 are provided on sides of the first strip 13 and the second strip 23 that face away from each other. The height of the third bulges 33 may be more than or less than the height of the first strip 13 or the second strip 23. In order to increase the friction of the fingers while reducing the discomfort of the fingers, the sides of the protrusions 3 that are away from the first strip 13 or the second strip 23 may be a cambered surface. In the present embodiment, the sides of the third bulges 33 that are away from the first strip 13 or the second strip 23 are cambered surfaces.

The Fifth Embodiment

FIG. 12 illustrates a zipper that is different with the first embodiment as below. In this embodiment, the protrusion 3 is provided as a plurality of bumps or ridges located on the same line that is parallel to the first strip 13.

The Sixth Embodiment

FIG. 13 illustrates a child resistant zipper bag that is different with the first embodiment as below. In this embodiment, an embossing is provided on the inner side of the bag body 4. The bag body 4 is a three-side sealing bag. In this embodiment, an embossing is provided on both sides of the bag body. The embossing 43 on the first film 41 is a relief pattern, and the embossing 43 on the second film 42 is also a relief pattern. When the bag body 4 is vacuumized, a channel for pumping air can be formed between the embossing 43 on the first film 41 and the embossing 43 on the second film 42, in order to facilitate vacuum pumping with a household vacuum sealer.

The Seventh Embodiment

FIG. 14 illustrates a zipper that is different with the first embodiment as below. In this embodiment, the second wing 2 further includes a second upper wing 21 that is provided in correspondence to the first upper wing 11 and is connected to a second lower wing 22. A first strip 13 is located between the first upper wing 11 and the first lower wing 12, and a second strip 23 is located between a second upper wing 21 and the second lower wing 22. A first tear line 44 is provided on the first upper wing 11 and the second upper wing 21, which is a perforated line. The first upper wing 11 and the second upper wing 21 may be separated from each other by tearing the first tear line 44. The distance between the first tear line 44 and the first strip 13, and the second strip 23 is less than 10 mm. In the present embodiment, the distance between the first tear line 44 and the first strip 13 is 2 mm; the distance between the first tear line 44 and the second strip 23 is 2 mm.

The principle of the zipper according to the present embodiment will be described below. A part of the first upper wing 11 and the second upper wing 21 of the zipper are torn open through the first tear line 44. Since the distance between the first tear line 44 and the first strip 13 and the distance between the first tear line 44 and the second strip 23 are too small, it is difficult to apply force with fingers. Therefore, it is difficult to unzip the zipper through the remaining of the first upper wing 11 and second upper wing 21. The zipper can be opened more conveniently by gripping the first bulges 31 and unzipping, with fingers at the same side of the zipper, the zippers in the same direction or opposite directions.

FIGS. 15 and 16 illustrate a child resistant zipper bag that is different with the first embodiment. On the bag body 4, a second tear line 45 is provided in correspondence to the first tear line 44. The second tear line 45 is a perforated line. In the present embodiment, the bag body 4, the first wing 1 and the second wing 2 are perforated simultaneously with a perforating knife to form the first tear line 44 and the second tear line 45. With cooperation of the first tear line 44 and the second tear line 45, after tearing the first tear line 44 and the second tear line 45, the distance between the opening of the bag body 4 and the first strip 13, the second strip 23 is relatively short, which makes it more difficult for children to open the bag body 4 from the opening of the bag. The bag body 4 can be opened as following: gripping the bag body 4 with hands at the positions of protrusions 3; two fingers at the same side of the bag body 4 sliding in the same direction or opposite directions such that the zipper is unzipped.

Reference to FIGS. 15 and 16 , a method of opening a bag includes the following steps:

-   S1: tearing a bag body 4 along a first tear line 44 and a second     tear line 45 such that a first upper wing 11 and a second upper wing     21 are separated from each other along the first tear line 44 and     the bag body 4 is torn open along the second tear line 45; -   S2: gripping, by two hands, a bag body 4 at a location where a first     strip 13 and a second strip 23 are located such that a protrusion 3     is gripped against by fingers through the bag body 4; -   S3: sliding, by two hands, the bag body 4 in the same direction or     opposite directions such that the interlocking between the first     strip 13 and a second strip 23 is misaligned; -   S4: opening the bag body 4 from a position at which the first strip     13 misaligns with the second strip 23.

The above description is only alternative embodiments of the present application and is not intended to limit the protection scope of the present application. Any equivalent structure, shape, or principle variations based on the present application should be included within the protection scope of the present application. 

1. A child resistant zipper, comprising: a first wing and a second wing, wherein at least one first strip is provided on an inner side of the first wing, at least one second strip is provided on an inner side of the second wing, the number of the second strip corresponds to that of the first strip, and the first strip is interlocked with the second strip, and a protrusion is integrally provided on an outer side of the first wing and/or an outer side of the second wing, wherein the protrusion comprises a bulge, the bulge is located at an area corresponding to a projection area of the first strip on the first wing and/or the bulge is located at an area corresponding to a projection area of the second strip on the second wing; the bulge is a continuous line, which is located at a back side of the first strip and/or the second strip; an interlocking between the first strip and the second strip is misaligned by sliding.
 2. (canceled)
 3. The child resistant zipper according to claim 1, wherein at least one second strip is provided on the first wing, at least one first strip is provided on the second wing, and the bulge is located at the area corresponding to the projection area of the second strip on the first wing and/or the bulge is located at the area corresponding to the projection area of the first strip on the second wing.
 4. The child resistant zipper according to claim 1, wherein at least one first strip and at least one second strip are provided on the first wing from top to bottom, and at least one second strip and at least one first strip are provided on the second wing from top to bottom; the first strip of the first wing is interlocked with the second strip of the second wing, and the first strip of the second wing is interlocked with the second strip of the first wing; the protrusion comprises a bulge that is located between the first strip and the second strip of the first wing and/or the second wing.
 5. The child resistant zipper according to claim 1, wherein the protrusion comprises a bulge, the bulge is integrally formed with the first strip and the second strip; the first strip and the second strip adopt a multi-snap-fit structure, and the first strip is interlocked with the second strip by snap-fit.
 6. The child resistant zipper according to claim 1, wherein a side of the protrusion that is away from the first strip or the second strip is a cambered surface.
 7. A child resistant zipper bag, wherein the child resistant zipper bag comprises a bag body that is connected with the zipper according to claim 1, wherein the first wing comprises a first upper wing and a first lower wing, which are integrally connected to each other; the first upper wing is located above a location where the first strip and/or the second strip are provided on the first wing, the first lower wing is located below the location where the first strip and/or the second strip are provided on the first wing, outer sides of the first upper wing and the first lower wing are connected to an inner side of the bag body; the second wing comprises a second lower wing that is provided in correspondence to the first lower wing, an outer side of the second lower wing is connected to an inner side of the bag body, the first strip and/or the second strip are located at an upper end of the second lower wing, and the strips of the first wing and the second wing are correspondingly interlocked with each other; and the protrusion is attached to the inner side of the bag body; wherein the protrusion comprises a bulge, the bulge is located at an area corresponding to a projection area of the first strip on the first wing and/or the bulge is located at an area corresponding to a projection area of the second strip on the second wing; the bulge is a continuous line, which is located at a back side of the first strip and/or the second strip; an interlocking between the first strip and the second strip is misaligned by sliding.
 8. The child resistant zipper bag according to claim 7, wherein the protrusion comprises a bulge, wherein the bulge is located at an area corresponding to a projection area of the first strip on the first wing and/or the bulge is located at an area corresponding to a projection area of the second strip on the second wing.
 9. The child resistant zipper bag according to claim 7, wherein at least one second strip is provided on the first wing, at least one first strip is provided on the second wing, and the bulge is located at the area corresponding to the projection area of the second strip on the first wing and/or the bulge is located at the area corresponding to the projection area of the first strip on the second wing.
 10. The child resistant zipper bag according to claim 7, wherein at least one first strip and at least one second strip are provided on the first wing from top to bottom, and at least one second strip and at least one first strip are provided on the second wing from top to bottom; the first strip of the first wing is interlocked with the second strip of the second wing, and the first strip of the second wing is interlocked with the second strip of the first wing; the protrusion comprises a bulge that is located between the first strip and the second strip of the first wing and/or the second wing.
 11. The child resistant zipper bag according to claim 7, wherein the protrusion comprises a bulge, the bulge is integrally formed with the first strip and the second strip; the first strip and the second strip adopt a multi-snap-fit structure, and the first strip is interlocked with the second strip by snap-fit.
 12. The child resistant zipper bag according to claim 7, wherein a side of the protrusion that is away from the first strip or the second strip is a cambered surface.
 13. The child resistant zipper bag according to claim 7, wherein the second wing further comprises a second upper wing that is provided in correspondence to the first upper wing and is integrally connected to the second lower wing at the location where the first strip and/or the second strip are provided on the second wing, and an outer side of the second upper wing is connected to the inner side of the bag body; and a first tear line is provided on the first upper wing and the second upper wing, a second tear line is provided on the bag body, the first tear line and the second tear line are in a same straight line, and a distance between the first tear line and the first strip is less than 10 mm.
 14. The child resistant zipper bag according to claim 9, wherein an embossing is provided on the inner side of the bag body.
 15. The child resistant zipper bag according to claim 13, wherein an embossing is provided on the inner side of the bag body.
 16. A method of opening a child resistant zipper bag according to claim 7, wherein the method comprising following steps: S1: gripping, by two hands, a bag body at a location where a first strip and a second strip are located such that a protrusion is gripped against by fingers through the bag body; S2: sliding, by two hands, the bag body in a same direction or opposite directions such that the interlocking between the first strip and the second strip is misaligned; S3: opening the bag body from a position at which the first strip misaligns with the second strip. 